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Chubu-Sangaku NP, Nagano
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About 12,000 years ago, the Azusa flowed west toward Gifu until an eruption in the Yakedake volcano group dammed it. A lake 400 m deep and 12 km long formed; over millennia, deposits filled it into today’s flat Kamikochi.
The silver-backed keشو yanagi beside the Azusa needs floods to expose fresh, sunny gravel for seedlings; its seeds stay viable for less than 3 weeks. In Japan, the species grows only in Nagano and Hokkaido.
A 1915 mudflow from Mt. Yakedake dammed the Azusa and created Taisho Pond. Later, boats carried construction materials across this new lake to build the Kamikochi Imperial Hotel.
In the late 19th century, mountaineer-clergyman Walter Weston recalled buying 12 freshly caught Azusa fish from a local angler to feed his party on the climb up Mt. Yari.
Each October, a Hotaka Shrine water rite sends a symbolic offering upstream: water is gathered where 3 rivers meet in Azumino, then carried to Myojin Pond beside the shrine’s Kamikochi sanctuary, in thanks for the water that sustains Azumino.
About 15 km downstream from Kamikochi, local girls once ran river-powered machines to unwind silkworm cocoons into thread. A local saying even credited the Azusa’s clear water with their fair skin.
Fourteen separate intakes once drew irrigation water from the Azusa. Floods wrecked them, while upstream diversions could leave downstream fields short; from 1926 to 1931, they were consolidated into a shared system.
The Azusa was a working timber route: Kamikochi’s valuable wood was floated downstream toward city markets, linking this remote mountain valley with Matsumoto.
Azusa is said to take its name from a tree prized for bow-making; azusayumi bows were traditionally offered to Japan’s Imperial court. The river’s name now also carries travelers between Tokyo and Matsumoto on the Azusa limited express.
The Azusa beneath Kappa Bridge entered Japanese fiction when Ryūnosuke Akutagawa described Kamikochi and the bridge in his 1927 satirical novella Kappa. The story helped make the bridge’s curious name widely known.
